Axial pulling tool



Dec. 2,' 1930. J.-w.' HOWELL 1,783,649

AXIAL PULLING TOOL Filed March 8, 19 28 %EYS Patented 1356.2, 1930 a L JA ES w."adw LL,- ommesmmflo m Thisinvention relates to tools'for removin'g ob eets axially fromshafts and'thelike onwhich theymay be mounted: It.is'par-' ticul'arly applicable to the removal of gears or sprockets, such as are fuseddriving the e chain's which operate the timing mechanism of- 1 tively small spacesg l 7 Another Object is to provide a tool-jwhich 5 will removesproekets or the like fromytheir supporting shafts andwhich will prevent damage to the surface of the sprocket or to" the end of the shaft.

Other-objects will hereinafter appear. The invention will be better understood panying drawinga'inwhichzv v Fi ure 1: 1s a s1de elevatlon oarts' broken 25 away, showing the tool being applied to sprocket such as is used for driving a silent cham; I V i Figure 2 1s a longitudinal sectional viewof the tool shown in'lligure 1, with its parts in the position which they occupy while remov I V latter q'A securing ring aois slidable over the two gripping sections when these ,are

ing thesprockemand V e i 1 Figure 3 1s an end elevation of the tool in the position shown in F1gure2.

Inthe drawings the end-ofa motor crankshaft is illustrated at 1, theshaft being provided with a central oil duct 2 leading to a cylindricalrecess 3 in'the end 'of'the shaft; sprocket 4 is mounted on'the end of the shaft and secured to rotate therewith a Wood-i posed to engage the links of a chainfor driv-: ing the timing gear of the motor or thellike:

' During. operation of the motor, other parts f I V These members are then shppedoverthe not shown'are associated with the end of the shaft for receiving oil from the duct and for retaining the gear upon the end of the shaft, these, however, being removed, as 1s the chain the sprocket is attempted.

ruff key 5. The sprocketfis shown as pro vided with four spaced sets of teeth :6, disillustrated in Figure 1, there heingESufiicient 'clearancein slot 12 to permit the angular driven by the sprocket, before the removal of. e V b firing. is, slipped oyer them into engagement The tool itself comprises'a pressure-exerting-screw Ior supplyingthe force necessary to remove the sprocket. The outer end of thisscrew isshown as having a cylindrical head 8 through whichiactuating bar or handie 9 extends. fl'he inner endof the screw has *swiveled thereto a cylindrical"bearing piece or shoe 10 adapted to engage the shouldei at the inner end oflthe recess 3 in the shaft and try-remain stationary witlrrespectto the shaft-while the 'en'dfi'of .theiscrew; revolves 1 within the shoe, thus preventinganyabrasimr of the shaft adj acentl'the endziof the duct 2.

Threaded: upon the shaft-is a transversely ex- 7 tending bar'or yoke 11 the outer ends of i which are? provided" with radially elongated perforations 12, through which extend'screws 1' "Threaded to the inwardly extending end of e'ach screw is a hollow;semi-cylindrical gr1ppnfg member 15 ,pr0v1dedon its lllIlBI surface: :with an inwardly extending flange the exposed 'Jpo'rtionsof the screws 13 and press the semi-cylindrical gripping members away from the*yoke,-;reta1n1ng1ithe screw heads in contact with the outer surface of the brought close together and retains them in this-position,ltheqoutersurface of the rings :bemg knurled to rp rov dei a better hold for the operator. :Proj ecting stops 21 on the ends of the yoke prevent the ring from sliding off the same whileitheitoolis; being applied-to the sprocketf a h .The operation ofthetoolis as follows The gripping members are separated, as

movement of screws 13- for this purpose.

sprocket until the flanges 17 may be slid into thespace between the teeth of-the sprocket,

when the halves are moved together into the -13, the heads 14 thereof. bearing upon the outer surface ofrthe yoke.

position shown inF-igure'fland thesecluring with the stops 18, retaining the flanges 17 in contact with and between the teeth of the sprocket so that longitudinal pressure may be transmitted thereto to remove it from the shaft. The pressure-exerting screw is then rotated by means of the handle and the pressure so produced draws the sprocket from the shaft, this being done without any scraping of either the teeth of the sprocket or the end of the shaft, while the connection between the tool and the sprocket is easily effected and is positive and capable of transmitting great pressure thereto.

It will be noted that the gripping members need extend beyond the teeth of the sprocket only bythe distance from the inner edge of the flange 17 to the outer edge of stops 18 and the tool may therefore be applied tothe sprockets even when there is relatively little space about the same.

lVhile I have described the illustrated em bodiment ofmy invention in some particularity, obviouslymany-variations and modifications thereof will readily occur'to those skilled in'the art to which this appertains, and I do not, therefore. limit myself to the precisedetails shown and described, but claim -as my invention all embodiments coming within the scope of the appended claims.

I claim:

'1. A tool for removing articles axially from shafts which comprises a longitudinally split cylinder adapted to surround a part of an article to be removed, each sector of the cylinder being provided with an inward- -ly directed flange for engaging projections on the article, a continuous ring slidable on to the exterior surface of said cylinderto re tain the halves thereof closely together, longitudinal-pressure-exerting means extendable into the hollow of said cylinder-to en- 7 2. A tool for removing an article from a shaft which comprises two semi-cylindrical,

hollow, article-engaging members provided on their interiors with inwardly: extending flanges for engaging projections on the arti cle, a continuous ring slidable over the exterior of the members to retain them together upon the article, a connecting member extending axially outwardly from each article engaging member, a yoke axially spaced from said article-engaging membersfor exerting pressure upon the ends of said connecting members, and a pressure-exerting screw threaded through the yoke for applying axial pressure upon the end of the shaft.

3. A tool for removing an article axially from a. shaft which comprises two semi-cylindrical gripping members adapted to surround a portion of an article to be removed, an inwardly extending flange on the interior surface of each gripping member to engage projections on the article, an outwardly extending stop on each gripping member, a continuous ring movable to surround the gripping members and to retain them in gripping position upon'the article, the stop preventing the ring from slipping beyond the gripping members, a headed screw threaded the screws and maintaining the gripping members and yoke apart, a longitudinal pressnre-exerting screw threaded through the yoke and extendable within'the space within thefgripping members, and a swivelled con- -tact-shoe for engagingthe end of a shaft carried bythe end of the-longitudinal pres sure exerting screw,

In. testimony whereof I hereunto aflix my signature this 5th day of March, 1928.

JAMES WV. HOWELL. 

